Richards’s partner, NZ champion jockey Danielle Johnson, also set to relocate as trainer accepts invitation from HK Jockey Club.
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Doyle, who secured joint third place in the contest won by Zac Purton last year, will represent Britain alongside her boyfriend Tom Marquand.
Hewitson, 23, will return to Hong Kong having cut short his stay in 2020 after he managed just three winners in six months.
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Trainer Tony Millard is investigating the logistics of a challenge on Australia’s most famous race, confident the four-year-old can stay 2m.
News from around the world in our round-up of international horse racing snippets.
The jockey had been stood down until the end of the season at a hearing into his conduct at a stewards’ inquiry.